We wish to thank two anonymous reviewers for their constructive comments. This work is jointly supported by the National Basic Research Program of China (973 Program, Grant 2012CB955401 and 2012CB417203), the National Natural Science Foundation of China (Grants 40905049 and 41375003), the China Meteorological Administration for the R&D Special Fund for Public Welfare Industry (Meteorology) (Grants GYHY201306016 and GYHY200906020), and the National High Technology Research and Development Program of China (863 Program, Grant 2010AA012304). ERA-Interim and APHRODITE data used in this study have been provided through the ECMWF (http://data-portal.ecmwf.int/data/d/interim_daily/) and APHRODITE’s water resources project (http://www.chikyu.ac.jp/precip).
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